Current electric brake adjusting screws have 8 notches.
The threads are 20 per inch.
Therefore, 8 clicks will move the adjuster 1/20 of an inch, 05 .050 of an inch.
Usually the brakes are adjusted by pull the wheel with one hand, so that it turns.
Then, turn the adjuster so that you cannot pull the wheel to make a circle, WITH ONE HAND, ONLY.
Then back off 5 to 6 notches or clicks.
If you hear any dragging, it won't be the shoes, but it will be the magnet dragging on the armature plate.